Gandalf pursued the Balrog from the depths of Moria. On the peak they fought for two days and nights from January 23 to 25 T.A.3019. During the battle, Durin's Tower was destroyed and the entrance to the Endless Stair was blocked. In the end, the Balrog was cast down and it broke the mountain-side as it fell. Gandalf himself died following this ordeal, but was later sent back to Middle-earth with even greater powers as Gandalf the White.